Noir means black in French. From the description of the tag, it is "A genre of crime film or fiction characterized by cynicism, fatalism, and moral ambiguity."
So basically: dark. Popular recent examples would be "My Name" and "Night in Paradise."
It's pretty funny. But so weird to see advertisements listed on MDL. I don't suppose people go, "Let's see, I'm in the mood to watch a 5-10min ad right now." Either way, seems like there are indeed quite a lot (more than 1) of such "shows" listed: https://kisskh.at/search?adv=titles&th=260&so=popular&or=desc
wat
So basically: dark. Popular recent examples would be "My Name" and "Night in Paradise."